This is the panTHERIA dataset, downloaded from the Ecological Archives, which is

… a global species-level data set of key life-history, ecological and geographical traits of all known extant and recently extinct mammals (PanTHERIA) developed for a number of macroecological and macroevolutionary research projects.

• Metadata and varianble definitions: http://esapubs.org/archive/ecol/E090/184/metadata.htm
• the dataset

Code to read in the data and assign levels in columns appropriately is provided in the file read_pantheria.R, which you can use as follows. If you are working in this directory (e.g., from the github repository) then you can just run:

source("read_pantheria.R")
pantheria <- read_pantheria(".")

If you need to download the files, then you can do this in R by first running:

url <- "https://uo-biostats.github.io/UO_ABS/CLASS_MATERIALS/Datasets/PanTHERIA/"
for (x in c("PanTHERIA_WR05_mammals.txt", "read_pantheria.R")) {
    download.file(paste0(url, x), x)
}

and then running the code above.